maillist inclusion
category: feature
bugzilla: https://gitee.com/openeuler/kernel/issues/I5J75G
CVE: NA

Reference: https://lore.kernel.org/rust-for-linux/CANiq72nDcJLSB3pLhkdqGdLitfmqqCUVVfkY5EjP9AcwVv9B4A@mail.gmail.com/T/#t

--------------------------------

This customizes the subset of the Rust standard library `alloc` that
was just imported as-is, mainly by:

  - Adding SPDX license identifiers.

  - Skipping `rc` and `sync` modules via new `cfg`s.

  - Skipping the `vec!` macro.

  - Addding fallible (`try_*`) versions of existing infallible methods
    (i.e. returning a `Result` instead of panicking).

    Since the standard library requires stable/unstable attributes,
    these additions are annotated with:

        #[stable(feature = "kernel", since = "1.0.0")]

    Using "kernel" as the feature allows to have the additions
    clearly marked. The "1.0.0" version is just a placeholder.
Co-developed-by: NAlex Gaynor <alex.gaynor@gmail.com>
Signed-off-by: NAlex Gaynor <alex.gaynor@gmail.com>
Co-developed-by: NWedson Almeida Filho <wedsonaf@google.com>
Signed-off-by: NWedson Almeida Filho <wedsonaf@google.com>
Co-developed-by: NGary Guo <gary@garyguo.net>
Signed-off-by: NGary Guo <gary@garyguo.net>
Co-developed-by: NMatthew Bakhtiari <dev@mtbk.me>
Signed-off-by: NMatthew Bakhtiari <dev@mtbk.me>
Signed-off-by: NMiguel Ojeda <ojeda@kernel.org>
Signed-off-by: NWeilong Chen <chenweilong@huawei.com>